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p { margin: 5px 1em; line-height: 1.5; width: 0; }
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<!-- U+FEFF is (deprecated) ZERO-WIDTH NO-BREAK SPACE -->
<p>abcdef&#xfeff;abcdef</p>
<p>abcdef)&#xfeff;(abcdef</p>
<p>abcdef &#xfeff;abcdef</p>
<p>abcdef&#xfeff; abcdef</p>
<p>abcdef&#xfeff;&#xfeff;&#xfeff;abcdef</p>

<p>コミュニ</p>
<p>コ&#xfeff;ミ&#xfeff;ュ&#xfeff;ニ</p>

<p>你好吗？</p>
<p>你&#xfeff;好吗？</p>
<p>你&#xfeff;好&#xfeff;吗？</p>
</div>

<div style="float:left; width: 15em;">
<!-- U+2060 is WORD JOINER -->
<p>abcdef&#x2060;abcdef</p>
<p>abcdef)&#x2060;(abcdef</p>
<p>abcdef &#x2060;abcdef</p>
<p>abcdef&#x2060; abcdef</p>
<p>abcdef&#x2060;&#x2060;&#x2060;abcdef</p>

<p>コミュニ</p>
<p>コ&#x2060;ミ&#x2060;ュ&#x2060;ニ</p>

<p>你好吗？</p>
<p>你&#x2060;好吗？</p>
<p>你&#x2060;好&#x2060;吗？</p>
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